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Acquisitions and Dispositions (Schedule of Preliminary Allocation of Purchase Price to Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Millions
Sep. 16, 2016
Sep. 30, 2016
Dec. 31, 2015
[1]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]      
Goodwill   $ 6,405 $ 3,294
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]      
Short-term debt outstanding   $ 3,097 $ 3,509
Dominion Questar Corporation      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]      
Total current assets $ 224    
Investments [2] 58    
Property, plant and equipment [3] 4,120    
Goodwill 3,111    
Total deferred charges and other assets, excluding goodwill 75    
Total Assets 7,588    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]      
Total current liabilities [4] 791    
Long-term debt [5] 963    
Deferred income taxes 798    
Regulatory liabilities 259    
Asset retirement obligations 160    
Other deferred credits and other liabilities [6] 220    
Total Liabilities 3,191    
Total estimated purchase price 4,397    
Short term debt 301    
Short-term debt outstanding 24    
Capital lease obligation 35    
Capital Leases, Future Minimum Payments, Net Present Value [Abstract]      
Remaining in 2016 1    
2017 4    
2018 4    
2019 4    
2020 4    
Remaining payments thereafter 37    
Dominion Questar Corporation | Short Term Note, Variable Rate, Maturing in February 2017      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]      
Short-term note outstanding $ 250    
Dominion Questar Corporation | Minimum      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]      
Useful lives 9 years    
Dominion Questar Corporation | Minimum | Unsecured Senior Notes, Maturities Range from 2017 to 2048 | Unsecured Senior Notes      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]      
Interest rate percentage 2.98%    
Dominion Questar Corporation | Maximum      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]      
Useful lives 18 years    
Dominion Questar Corporation | Maximum | Unsecured Senior Notes, Maturities Range from 2017 to 2048 | Unsecured Senior Notes      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]      
Interest rate percentage 7.20%    
Dominion Questar Corporation | White River Hub, LLC      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]      
Equity method investment $ 40    
[1] Dominion’s Consolidated Balance Sheet at December 31, 2015 has been derived from the audited Consolidated Financial Statements at that date.
[2] Includes $40 million for an equity method investment in White River Hub. The fair value adjustment on the equity method investment in White River Hub is considered to be equity method goodwill and is not amortized.
[3] Nonregulated property, plant and equipment, excluding land, will be depreciated over remaining useful lives primarily ranging from 9 to 18 years.
[4] Includes $301 million of short-term debt, of which $24 million is outstanding at September 30, 2016, as well as a $250 million short-term note which matures in February 2017 and bears interest at a variable rate.
[5] Unsecured senior notes have maturities which range from 2017 to 2048 and bear interest at rates from 2.98% to 7.20%.
[6] Includes a $35 million capital lease obligation with undiscounted future minimum lease payments of $1 million remaining in 2016, $4 million per year for 2017 through 2020, and $37 million in total thereafter.